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In the sun, and other stars, it is nuclear fusion which provides the power which enables life on earth to flourish. The nuclear reaction in the sun is called the proton-proton reaction, which produces helium and releases energy. This is promoted by the huge pressure at the sun's centre, and of course it started naturally, presumably as the sun attracted matter from space and gradually grew in size. The sun's reactions are at the core, and the energy spreads out so that the surface which we see is sending out light and infra-red radiation because it is incandescent.
On earth, in man made equipment, it is not possible to produce the conditions in the sun's core, and it is necessary to heat a gas plasma to much higher temperatures before fusion will occur. The power density in the sun's core is surprisingly low in fact, and to make a reaction chamber with those conditions it would have to be too large to be possible or economic. So for man made fusion the gas plasma has to be heated to hundreds of millions of degrees C, and the most promising way to do this is using magnetic confinement in a tokamak or torus shaped chamber. Plasma just means an ionised hot gas. Theoretically the reaction requiring the least energy to start it is between nuclei of deuterium and tritium (both hydrogen isotopes) and that is what is being experimented with. So far fusion has been produced but only for a fraction of a second (see JET in Wikipedia).
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Explain why increased ecosystem diversity contributes to increased biodiversity in the biosphere.?
Increased ecosystem diversity enhances biodiversity by providing a wider range of habitats and niches, which support a greater variety of species. Diverse ecosystems can better accommodate the needs of different organisms, promoting interactions and relationships that foster species richness. Additionally, varied ecosystems are more resilient to environmental changes and disturbances, allowing for sustained biodiversity over time. This interconnectedness and stability contribute to a more robust biosphere overall.
Why does The muscle cells responsible for bumblebee flight have a large amount of mitochondria. Explain why.?
The muscle cells responsible for bumblebee flight contain a high density of mitochondria to meet the intense energy demands of rapid wing movement. Mitochondria are the cell's powerhouses, generating ATP through aerobic respiration, which is crucial for sustained flight. The large number of mitochondria enables bumblebees to efficiently produce the energy needed for their high metabolic rate during flight, allowing them to hover and maneuver effectively.
Explain why the plants will die if the temperature is too high?
Plants can die if temperatures exceed their tolerance levels because excessive heat can disrupt their physiological processes, such as photosynthesis and respiration. High temperatures can lead to increased transpiration, causing water loss and dehydration. Additionally, extreme heat can damage cellular structures and proteins, leading to stress responses that may ultimately result in plant death if conditions do not improve. Overall, sustained high temperatures create an environment that is often too harsh for plants to survive.
Explain what is potent and least abundant mineralocorticoid?
Aldosterone is the most potent mineralocorticoid, playing a key role in regulating the body's salt and water balance by acting on the kidneys. On the other hand, deoxycorticosterone (DOC) is a less potent and least abundant mineralocorticoid that also helps regulate electrolyte balance but to a lesser extent compared to aldosterone.
If steam condenses on your hand it is more painful than dropping boiling water on your hand explain this as fully as you can?
When steam condenses on your skin, it releases a significant amount of latent heat, which is the energy released when water vapor transitions from gas to liquid. This heat transfer occurs over a larger surface area and for a longer duration than boiling water, leading to more intense and prolonged heat exposure. In contrast, boiling water quickly transfers heat but does not provide the same sustained thermal energy as steam. Therefore, the pain from condensing steam can be more intense due to this greater heat release and longer contact time.
Explain how the ecological balance in your community can be sustained?
Stay Clean Our Environment,,,
What is an electrically maintained tuning fork and explain its working?
It is a tuning fork whose vibrations are sustained (by hammering it continuously in a way similar to the break and make arrangement of electric bell) with the help of an electromagnet.
Briefly explain where the energy comes from in a one-minute sustained muscle contraction?
During a sustained one-minute muscle contraction, the first 4-6 seconds of energy comes from stored ATP. The next 6-15 seconds of energy comes from the transfer of creatine phosphate and ADP to form additional ATP. The last 15-60 seconds of energy comes from glycolysis.
What intellectual movement that applied reason and mdash sustained rational thought and mdash to all forms of human activity the U.S. Constitution was inspired by the principles of this movement?
Simple rules that explain the complex behaviors found in nature
What does SR mean on the side of tires?
"Let me explain the speed ratings, though. Remember HR, SR, TR, VR, and ZR? Respectively, the tire is good up to 110, 115, 125, 149, and 150+ for long sustained speeds. If there is just an "R" then 105 is the sustained limit for safety at that speed. The higher speed rating will also bring increased ride harshness, as the tires have to be built to withstand the speeds for which they are capable." - http://www.midsouthvw.com/TechTips/tech_tip_tires.htm
What are the 4 categories of tablets that should never be crushed and explain why?
THERE ARE BASICALLY THREE GROUPS OF medications that should never be crushed, cut in half, or chewed: ENTERIC COATED-they are coated to disslove in the intestine, otherwise it can cause gastric irritation. TIME-RELEASE CAPSULES (also called spansules) -they are meant to be released over time, otherwise it can cause an overdose. SUSTAINED-RELEASE TABLETS- they are meant to be released over time, otherwise it can cause an overdose. Some common 2 letter abbreviations after the name of the medication to indicated time-relaease or sustained release::LA (long acting); DR (delayed release); SA (slow acting); SR (sustained release); ER (extended release).Read labels CAREFULLY.
In your own worda explain how resonance occurs when you play a horn?
Resonance in a horn occurs when the vibrations generated by the player match the natural frequency of the horn itself. This causes the air inside the horn to vibrate sympathetically, amplifying the sound. As a result, the horn produces a louder and more sustained tone.
Explain how equilibrium in international market can be achieved and what factors can influencing its equilibrium?
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Explain why in the 1490 and early 1500 there was only a small number of African slaves in the Caribbean?
Because the economic value of agriculture had just began to grow and was not fully developed in the Caribbean. Remember that as the economic value of agriculture grew, the greater the number of slaves grew so that the economic standard could be sustained. As a result, there wasn't many African slaves in the Caribbean during that era.
Blackberry Mobile Phones?
form_title=Blackberry Mobile Phones form_header=Get connected with confidence! Find a mobile phone repair specialist near you. Model of Blackberry?*= _[50] Are you having a problem with applications?*= () Yes () No Is your phone currently under warranty?*= () Yes () No Has the phone been dropped or sustained any water damage recently?*= () Yes () No What problem(s) are you experiencing with your phone?*= _Please Explain[100]
What is breaking monsoon explain?
Breaking monsoon is a weather phenomenon that occurs when the monsoon rains in a region suddenly weaken or stop after a period of sustained heavy rainfall. This can lead to drought conditions and impact agriculture and water resources in the affected area. Various factors such as changes in atmospheric circulation patterns, sea surface temperatures, and local topography can contribute to a breaking monsoon.
If you had to pick a specific food that was high in potential energy to include in your diet which food would you pick and explain how this food is high in potential energy.?
I would pick nuts, such as almonds or cashews, as they are high in potential energy due to their dense concentration of healthy fats, proteins, and carbohydrates. These nutrients provide long-lasting energy when metabolized in the body, making nuts a great choice for sustained fuel and satiety throughout the day.
